1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 // <algorithm> 10 11 // UNSUPPORTED: c++03, c++11, c++14, c++17 12 // UNSUPPORTED: libcpp-has-no-incomplete-ranges 13 14 // template<input_iterator I, sentinel_for<I> S, weakly_incrementable O> 15 // requires indirectly_copyable<I, O> 16 // constexpr ranges::copy_result<I, O> ranges::copy(I first, S last, O result); 17 // template<input_range R, weakly_incrementable O> 18 // requires indirectly_copyable<iterator_t<R>, O> 19 // constexpr ranges::copy_result<borrowed_iterator_t<R>, O> ranges::copy(R&& r, O result); 20 21 #include <algorithm> 22 #include <array> 23 #include <cassert> 24 #include <ranges> 25 26 #include "almost_satisfies_types.h" 27 #include "test_iterators.h" 28 29 template <class In, class Out = In, class Sent = sentinel_wrapper<In>> 30 concept HasCopyIt = requires(In in, Sent sent, Out out) { std::ranges::copy(in, sent, out); }; 31 32 static_assert(HasCopyIt<int*>); 33 static_assert(!HasCopyIt<InputIteratorNotDerivedFrom>); 34 static_assert(!HasCopyIt<InputIteratorNotIndirectlyReadable>); 35 static_assert(!HasCopyIt<InputIteratorNotInputOrOutputIterator>); 36 static_assert(!HasCopyIt<int*, WeaklyIncrementableNotMovable>); 37 struct NotIndirectlyCopyable {}; 38 static_assert(!HasCopyIt<int*, NotIndirectlyCopyable*>); 39 static_assert(!HasCopyIt<int*, int*, SentinelForNotSemiregular>); 40 static_assert(!HasCopyIt<int*, int*, SentinelForNotWeaklyEqualityComparableWith>); 41 42 template <class Range, class Out> 43 concept HasCopyR = requires(Range range, Out out) { std::ranges::copy(range, out); }; 44 45 static_assert(HasCopyR<std::array<int, 10>, int*>); 46 static_assert(!HasCopyR<InputRangeNotDerivedFrom, int*>); 47 static_assert(!HasCopyR<InputRangeNotIndirectlyReadable, int*>); 48 static_assert(!HasCopyR<InputRangeNotInputOrOutputIterator, int*>); 49 static_assert(!HasCopyR<WeaklyIncrementableNotMovable, int*>); 50 static_assert(!HasCopyR<UncheckedRange<NotIndirectlyCopyable*>, int*>); 51 static_assert(!HasCopyR<InputRangeNotSentinelSemiregular, int*>); 52 static_assert(!HasCopyR<InputRangeNotSentinelEqualityComparableWith, int*>); 53 54 static_assert(std::is_same_v<std::ranges::copy_result<int, long>, std::ranges::in_out_result<int, long>>); 55 56 template <class In, class Out, class Sent = In> 57 constexpr void test_iterators() { 58 { // simple test 59 { 60 std::array in {1, 2, 3, 4}; 61 std::array<int, 4> out; 62 std::same_as<std::ranges::in_out_result<In, Out>> auto ret = 63 std::ranges::copy(In(in.data()), Sent(In(in.data() + in.size())), Out(out.data())); 64 assert(in == out); 65 assert(base(ret.in) == in.data() + in.size()); 66 assert(base(ret.out) == out.data() + out.size()); 67 } 68 { 69 std::array in {1, 2, 3, 4}; 70 std::array<int, 4> out; 71 auto range = std::ranges::subrange(In(in.data()), Sent(In(in.data() + in.size()))); 72 std::same_as<std::ranges::in_out_result<In, Out>> auto ret = std::ranges::copy(range, Out(out.data())); 73 assert(in == out); 74 assert(base(ret.in) == in.data() + in.size()); 75 assert(base(ret.out) == out.data() + out.size()); 76 } 77 } 78 79 { // check that an empty range works 80 { 81 std::array<int, 0> in; 82 std::array<int, 0> out; 83 auto ret = std::ranges::copy(In(in.data()), Sent(In(in.data() + in.size())), Out(out.data())); 84 assert(base(ret.in) == in.data()); 85 assert(base(ret.out) == out.data()); 86 } 87 { 88 std::array<int, 0> in; 89 std::array<int, 0> out; 90 auto range = std::ranges::subrange(In(in.data()), Sent(In(in.data() + in.size()))); 91 auto ret = std::ranges::copy(range, Out(out.data())); 92 assert(base(ret.in) == in.data()); 93 assert(base(ret.out) == out.data()); 94 } 95 } 96 } 97 98 template <class In, class Out> 99 constexpr void test_sentinels() { 100 test_iterators<In, Out>(); 101 test_iterators<In, Out, sized_sentinel<In>>(); 102 test_iterators<In, Out, sentinel_wrapper<In>>(); 103 } 104 105 template <class Out> 106 constexpr void test_in_iterators() { 107 test_iterators<cpp20_input_iterator<int*>, Out, sentinel_wrapper<cpp20_input_iterator<int*>>>(); 108 test_sentinels<forward_iterator<int*>, Out>(); 109 test_sentinels<bidirectional_iterator<int*>, Out>(); 110 test_sentinels<random_access_iterator<int*>, Out>(); 111 test_sentinels<contiguous_iterator<int*>, Out>(); 112 } 113 114 template <class Out> 115 constexpr void test_proxy_in_iterators() { 116 test_iterators<ProxyIterator<cpp20_input_iterator<int*>>, Out, sentinel_wrapper<ProxyIterator<cpp20_input_iterator<int*>>>>(); 117 test_iterators<ProxyIterator<forward_iterator<int*>>, Out>(); 118 test_iterators<ProxyIterator<bidirectional_iterator<int*>>, Out>(); 119 test_iterators<ProxyIterator<random_access_iterator<int*>>, Out>(); 120 test_iterators<ProxyIterator<contiguous_iterator<int*>>, Out>(); 121 } 122 123 constexpr bool test() { 124 test_in_iterators<cpp20_input_iterator<int*>>(); 125 test_in_iterators<forward_iterator<int*>>(); 126 test_in_iterators<bidirectional_iterator<int*>>(); 127 test_in_iterators<random_access_iterator<int*>>(); 128 test_in_iterators<contiguous_iterator<int*>>(); 129 130 test_proxy_in_iterators<ProxyIterator<cpp20_input_iterator<int*>>>(); 131 test_proxy_in_iterators<ProxyIterator<forward_iterator<int*>>>(); 132 test_proxy_in_iterators<ProxyIterator<bidirectional_iterator<int*>>>(); 133 test_proxy_in_iterators<ProxyIterator<random_access_iterator<int*>>>(); 134 test_proxy_in_iterators<ProxyIterator<contiguous_iterator<int*>>>(); 135 136 { // check that ranges::dangling is returned 137 std::array<int, 4> out; 138 std::same_as<std::ranges::in_out_result<std::ranges::dangling, int*>> auto ret = 139 std::ranges::copy(std::array {1, 2, 3, 4}, out.data()); 140 assert(ret.out == out.data() + 4); 141 assert((out == std::array{1, 2, 3, 4})); 142 } 143 144 { // check that an iterator is returned with a borrowing range 145 std::array in {1, 2, 3, 4}; 146 std::array<int, 4> out; 147 std::same_as<std::ranges::in_out_result<int*, int*>> auto ret = std::ranges::copy(std::views::all(in), out.data()); 148 assert(ret.in == in.data() + 4); 149 assert(ret.out == out.data() + 4); 150 assert(in == out); 151 } 152 153 { // check that every element is copied exactly once 154 struct CopyOnce { 155 bool copied = false; 156 constexpr CopyOnce() = default; 157 constexpr CopyOnce(const CopyOnce& other) = delete; 158 constexpr CopyOnce& operator=(const CopyOnce& other) { 159 assert(!other.copied); 160 copied = true; 161 return *this; 162 } 163 }; 164 { 165 std::array<CopyOnce, 4> in {}; 166 std::array<CopyOnce, 4> out {}; 167 auto ret = std::ranges::copy(in.begin(), in.end(), out.begin()); 168 assert(ret.in == in.end()); 169 assert(ret.out == out.end()); 170 assert(std::all_of(out.begin(), out.end(), [](const auto& e) { return e.copied; })); 171 } 172 { 173 std::array<CopyOnce, 4> in {}; 174 std::array<CopyOnce, 4> out {}; 175 auto ret = std::ranges::copy(in, out.begin()); 176 assert(ret.in == in.end()); 177 assert(ret.out == out.end()); 178 assert(std::all_of(out.begin(), out.end(), [](const auto& e) { return e.copied; })); 179 } 180 } 181 182 { // check that the range is copied forwards 183 struct OnlyForwardsCopyable { 184 OnlyForwardsCopyable* next = nullptr; 185 bool canCopy = false; 186 OnlyForwardsCopyable() = default; 187 constexpr OnlyForwardsCopyable& operator=(const OnlyForwardsCopyable&) { 188 assert(canCopy); 189 if (next != nullptr) 190 next->canCopy = true; 191 return *this; 192 } 193 }; 194 { 195 std::array<OnlyForwardsCopyable, 3> in {}; 196 std::array<OnlyForwardsCopyable, 3> out {}; 197 out[0].next = &out[1]; 198 out[1].next = &out[2]; 199 out[0].canCopy = true; 200 auto ret = std::ranges::copy(in.begin(), in.end(), out.begin()); 201 assert(ret.in == in.end()); 202 assert(ret.out == out.end()); 203 assert(out[0].canCopy); 204 assert(out[1].canCopy); 205 assert(out[2].canCopy); 206 } 207 { 208 std::array<OnlyForwardsCopyable, 3> in {}; 209 std::array<OnlyForwardsCopyable, 3> out {}; 210 out[0].next = &out[1]; 211 out[1].next = &out[2]; 212 out[0].canCopy = true; 213 auto ret = std::ranges::copy(in, out.begin()); 214 assert(ret.in == in.end()); 215 assert(ret.out == out.end()); 216 assert(out[0].canCopy); 217 assert(out[1].canCopy); 218 assert(out[2].canCopy); 219 } 220 } 221 222 return true; 223 } 224 225 int main(int, char**) { 226 test(); 227 static_assert(test()); 228 229 return 0; 230 } 231